Bill Gates says the world is facing two options: A ‘major war’ or another pandemic in less than 30 years

There are some questions that keep even billionaire philanthropist and entrepreneur Bill Gates up at night. Will there be another pandemic? Are global tensions going to reach a boiling point, sparking a global war? What would push us to that precipice?

While Gates, a father of three, is determinedly optimistic about the likes of AI and eradicating deadly diseases like polio, he remains concerned about either a widespread war or another pandemic.

He cited "a lot of unrest" in the world at the moment, which could spark "a major war."

But even if that conflict is avoided, "then yes, there will be another pandemic, most likely in the next 25 years,” Gates told CNBC Make It.